Take out the expo.? I guess if you have soo much that the airplane is sluggish in the air maybe... I use triple rates and expo. on every airplane that I have- Your situation sounds like the dual rates are what is needed most- I would start with what the MFG. suggests and maybe 25-35% expo. on high rates only.

Do you tend to over-control your airplanes? or are you comfortable making small stick movements and prefer to have the higher deflections if needed?

Did the airplane seem "squirrely" or too "sluggish"?

I set all my planes for the most possible deflection at high rates, [X(] then for medium I set them at the high-end of the MFG. suggestions, then a tad lower for low rates- All mine are WAY to sensitive, other experienced fliers have a hard time flying my planes